build info on bottom left of screen area

vite.config.ts

@@ -5,6 +5,7 @@ import { VitePWA } from 'vite-plugin-pwa';
 import * as path from 'path' // ✅ Import path module
 import { readFileSync, renameSync, existsSync, unlinkSync } from 'node:fs'
 import { fileURLToPath } from 'node:url'
+import { execSync } from 'node:child_process'
 
 const rootDir = path.dirname(fileURLToPath(import.meta.url))
 
@@ -49,7 +50,19 @@ function emitLocalnetShellAsIndexHtml (mode: string): Plugin {
 // https://vitejs.dev/config/
 export default defineConfig(({ command, mode }): UserConfig => {
   const useLocalnetShell = mode === LOCALNET_MODE
+
+  let gitHash = 'unknown'
+  try {
+    gitHash = execSync('git rev-parse --short HEAD').toString().trim()
+  } catch {}
+
+  const buildDate = new Date().toISOString()
+
   return {
+  define: {
+    __BUILD_DATE__: JSON.stringify(buildDate),
+    __GIT_HASH__: JSON.stringify(gitHash),
+  },
   plugins: [
     useLocalnetShellHtml(mode, command),
     emitLocalnetShellAsIndexHtml(mode),